Florida Cosmetology Licensing ExamHair ServicesEasy
A cosmetologist is preparing to apply a permanent color to a client. Before mixing the color, they must select the appropriate developer. The client desires to lift their natural hair color by 2-3 levels and achieve good grey coverage. Which volume of hydrogen peroxide would be most suitable for this service?
- A20 volume
- B30 volume
- C10 volume
- D40 volume
Show answer & explanationAnswer & explanation
Correct answer: A. 20 volume
20 volume hydrogen peroxide is typically used for standard lift (1-2 levels), good grey coverage, and to achieve darker results. It provides sufficient lift for 2-3 levels when combined with permanent color, making it the most versatile and appropriate choice for the client's request.
Why the other options are wrong
- B. 30 volume is used for 3-4 levels of lift and can be too strong for standard grey coverage or if maximum lift isn't the primary goal.
- C. 10 volume is used for depositing color, achieving darker results, or toning, but provides minimal to no lift.
- D. 40 volume provides maximum lift (up to 4-5 levels) and is generally used with lighteners or for high-lift blondes, but carries a higher risk of damage and is not ideal for standard grey coverage.
Hydrogen Peroxide Developer Volumes
Hydrogen peroxide (H2O2) acts as an oxidizing agent in hair color and lightener, breaking down melanin and activating color molecules. Its strength is measured in 'volume'.
- Higher volume = more lift, faster reaction.
- Lower volume = less lift, more deposit, gentler.
- Standard volumes are 10, 20, 30, and 40.
Memory trick: Every 10 volume is a STEP in lift, but 20 is the SWEET spot.